Radial basic furnace roof



Oct. 24, 1961 Filed Jan. 6, 1959 L. S. LONGENECKER RADIAL BASIC FURNACE ROOF 4 Sheets-Sheet 1 H/S ATTORNEYS Oct. 24, 1961 L. s. I ONGENECKER 3,005,423

RADIAL BASIC FURNACE ROOF Filed Jan. 6, 1959 4 Sheets-Sheet 2 H/s ATTORNEYS Oct. 24, 1961 l.. s. LoNGENl-:CKER 3,005,423

RADIAL BASIC FURNACE ROOF med Jan. e, 1959 4 sheets-sheet s w 231.-,` 25 esq as H/.S` ATTORNEYS OGL 24, 1961 L.. s. I ONGENECKER 3,005,423

RADIAL BASIC F'URNACE ROOF Filed Jan. 6, 1959 4 Sheets-Sheet 4 INVENTOR. Lew S. Longenecker BYM/ 1% H/.S` ATTOHNE YS States This invention relates to a furnace roof construction and particularly to a construction suitable for suspending basic refractory brick. A phase of the invention relates to a partially suspended radial type of roof for a furnace such as an open hearth furnace which may be subjected -to relatively high temperatures.

Normally, a silica sprung roof on an open hearth furnace when heated -will raise up somewhat uniformly and then settle Vback down without causing material disturbance to its structural stability. However, the same sprung roof using basic brick will raise up with absolutely no uniformity. It will sag `badly in spots and will excessively buckle outwardly in adjacent spots to such a serious degree that the roof loses its stable contour and will tend to collapse. This erratic behavior has given rise to the Igeneral belief by those skilled in the art that basic brick when used in a roof must be fully suspended and equipped with many expansion joints.

The general weakness of the bond in basic brick makes it necessary to employ a suitable number of steel reinforcing plates such as outer encasement and internal plates. vThe rigid behavior of such numerous plates in the join-ts between the bricks will cause a sprung roof when heated up to raise on the very inner tips of each brick. Due to this knife edge type of contact of plate on plate, the heat-up or roof rise does not need to progress very far until the brick will slip and kick out of place. Such jumping around from knife edge to knife edge contact very soon throws the whole roof out of contour. All of this can and will occur lbefore the plates become hot enough to yield.

I have also yfound that a chemically bonded basic brick, without any plates, will show a marked subsidence, if the brick is under load when given the first firing or heating up. The amount of subsidence is apparently dependent on the load and the temperature. It will begin Vat a temperature of about 1200 degrees F. and will end at about 2300 degrees F. When an open hearth furnace roof using ,l2-inch thick basic brick with plates reaches equilibrium with the inside face at about 3000 ,degrees F., the temperature gradient line of 1200 degrees will be about three inches under the outside surface, and the 2300 degree gradient line will be about four inches under the hot face or surface.

In endeavoring to find a solution to the problem, I came to the conclusion that basic brick may be made to behave in a sprung type roof by utilizing a proper hold-down to keep them from rising up and jumping Iaround during the first heating up operation. Chemically bonded type of brick has a toughness when green and a burning-in `subsidence to accommodate the thermal expansion. This subsidence will function up to practically 2300 degrees F. at which point the plates tend to become soft and yieldable. I have found that a mixture of roll scale and steel chips, or a partially oxidized plate will melt at a temperature of about 2400 .degrees F. Thus, it can be expected that the inner ends of all the plates will be melted o ff at a distance of about 3 inches back into the brickwork. With lthe 1/2 inch plate thickness per foot completely gone from the inner zione, it can be safely assumed that there is no sprung .arch load carried by the inner hot brick ends. In fact, there will be some excess space remaining to accomatent C? l3,005,423 Patented oct. 24, 1961 ICC Z modate the growth resulting from the liron oxide absorption.

A typical prior art roof construction for a basic sprung arch employs a hold-down arrangement that utilizes a multiple series of individual jacks. Smooth embedded plates are, in effect, individually and pivotally carried on a jack-supported cross member by pairs of suspension rods or hanger hooks which engage with'pipe members that extend through opposite ends of the plate members. This provides a construction that is Anot stable and involves an insecure manner `of jacking `down or bracing the roof.

It has thus been an object of my invention to devise a radial type of roof which will meet the problems heretofore encountered in furnace constructions, particularly from the standpoint of the utilization of so-called ,basic brick;

Another object has been to device a new and improved form of roof construction for a Vfurnace which will n ot only make its brickwork stable and thus increase its operating life, but will facilitate repair and maintenance of its brick members;

A further object has been to provide a roof construction, that contrary to the prior art constructions, can be installed without a center and that employs continuous chords with the tie trusses and beams -in a suspended roof construction;

A still further object has been to provide a roof construction employing side plates Which are interlatched between cross beam members and which provide expansion exibility with an alignment holding action when the roof is heated up such that the individual bricks are held to the contour of the roof arch and cooperatively with respect to each other;

Theseand other objects of my invention will appear to those Vskilled in the art from the illustrated embodiments.

In the drawings, FIGURE 1 is a side View in elevation and partial section through a lfurnace roof construction of my invention;

FIGURE 2 is a vertical end or transverse section at right angles to, on the same scale as, and taken along the line II-II 0f FIGURE l;

FIGURE 2A is a top plan :fragment on the scale 1of FIGURES l and 2, particularly illustrating the arrangement arch or chord members of my construction;

FIGURE 2B is a vertical end fragment of the construction of FIGURE l showing a modified arrangement of structural members to facilitate the employment of an oxygen lance;

FIGURE 3 is an enlarged side fragment of the construction ot FIGURE 1, illustrating details of the construction aud with particular reference to rows of shorter length or valley refractory brick members;

FIGURE 4 is an end o r transverse section in elevation on the scale of `and taken along the line IV-IV of FIGURE 3;

FIGURE 5 is a view similar to and on the same scale as FIGURE 3, but taken along a row of longer or ridge refractory brick members;

FIGURE 6 is an enlarged side fragment in elevation on the scale of FIGURES 3 to 5, inclusive, illustrating de tails of skewback edge or end mounting of the brick members of my roof construction and with particular reference to the longer brick members;

FIGURE 7 is a perspective view in elevation showing the construction of refractory brick or block members of the ridge or longer length type of FIGURE 5; FIGURE 7A is a similar View of valley or shorter length brick members of FIGURES l and 3; it will be noted that the ridge and valley brick members have substantially the 3 same construction and dimensions, except that one is longer than the other, and it will be further noted that both are slightly wider at their top end portions than at their bottom end portions;

, length brick;

And, FIGURE l is a view similar to FIGURES 8 and 9 illustrating a smooth form of plate construction which may be employed.

I have determined that the hold-down steel or truss 'structure must be rigid and snug enough to keep the roof from raising up on its toes and then toppling out of shape. It must be strong enough to withstand the push as thermal expansion is squeezed into an equal brick subsidence. It must brace the roof in all directions and hold it to the original contour throughout the complete service life. Any shifting or change in contour tends to cause the inside soft face of the brick to be pinched o. Once separated and out of contact with parent brick, the inner shell will deteriorate very fast and soon fall into the furnace. This type of failure is known as peeling or slabhing off.

Referring particularly to FIGURE l of the drawings, my roof construction I6 is shown provided with spacedapart and transversely-extending, overhead or cross channel structural members Il that along their lower reaches are rigidly secured to and support a longitudinally-extending transversely spaced-apart series of channel member pairs 12, see also FIGURE 2. Each pair of the members 12 has a bottom-secured, transversely-extending angle connector member 13 to define an integral structural support unit for each of a plurality of vertically-projecting, rigid, angle-shaped, suspension members 14. As shown particularly in FIGURE l, the members I4 serve as rigid anchor suspension members and towards the longitudinal end reaches of the roof arch are shown reinforced by diagonal angle-shaped members 15 to tie-in adjacent mem- -bers 14 with respect to each other along the roof and towards its center, mid or highest point of support. The vertical members 14 and diagonal members I5 are rigidly secured at their lower ends to cross-extending, longitudinally spaced-apart, I-beam rigid support members I7 vby chord or radial members i6, shown of angle shape.

As shown particularly in FIGURE l, the direct roof: holding rigid support members I7 are carried from the roof truss structure or framework at their upper flanges and are arranged in a radial or curvilinear spaced-apart relationship with respect to each other to extend transversely of the roof. Transversely spaced-apart continuous chord or arch backup members I6 of radial, arcuate or curved shape also extend along the top anges of the beam members 17 and are secured thereto to tie the beams together as a unit and to the truss construction, including the suspension members I4 and l5. It will be noted that there are a series of chord or radial members I6 that extend longitudinally of the furnace and have a spaced-apart relationship with respect to each other to lie along and in secured abutment with side anges of the members 14 and 15. The chord members 16 may be of angle construction, so that their side flanges will abut with the verti` cal or side flanges of the members 14 and I5.

The members 16 serve as hold-downs for the arch roof construction and in combination with the cross beam or support members I7 to also brace the roof against buckling. This construction serves as a back stop against which expansion of the roof can work to establish some stability as it is heated-up and put into service. Since the refractory brickwork of the roof when installed is positioned loosely against this steel work, it holds the brickwork roof in its original contour from hot to cold and throughout its useful life.

Side plate members 23 and 23', as shown particularly in FIGURES 3 and 5, are notched or provided with latch portions at their opposite longitudinal ends to interlateh with and between adjacent pairs of the cross support or hold-down beam members I7 and are hung therefrom and embedded between refractory brick in rows which run longitudinally of the roof. It will be noted that upper end portions of the side plate members 23 and 23 extend well above the brickwork and upwardly along the web portions of the support members 17 to thus serve as valuable cooling fins. These plates bring the combined plate thickness, lengthwise of the furnace, up to about 1/2 inch per foot which may be equal to the plate thickness across the furnace. Thus, voids to handle the growth of the inner surface of the brickwork Will be in an equal amount in both length and width directions of the furnace.

The brick are installed in a ridge and valley assembly arrangement, as shown for example in FIGURE 4, with the longer or ridge brick 2l in contact or near contact with the bottom flange of the support members I7, see also FIGURE 5. Valley or shorter length brick 22 are positioned in longitudinal rows and staggered transverse groups between the ridge brick 21, see FIGURES 2 and 4. This rib type construction as to the brickwork exposes some of the brick ends which serve as air cooling :tins and allows the hold-down beams 17 to make only spot contact with hot brick.

As shown particularly in FIGURES 7 and 7A, the brick 2l and 22 are of somewhat key shape and can be installed as a sprung roof when a center is used and hanger or side plate members of a smooth face type, such as shown in FIGURE l0, are employed. The pinch of the brick on the plates when the roof is heated up will cause the smooth plates to serve as partial hangers. I, however, prefer to utilize plates having outstanding side tabs which interlatch with brick notches, as shown in FIGURE 4. In such a case, the plates serve as positive hangers and make possible installing a roof without the use of a center. Positive hanger type plates also prove very helpful when making hot patches to the roof. For economy, however, an original installation may employ all smooth plates and punch plates may be used for patch purposes. Another choice is to use punch plates, see FIGURES 8 and 9, in the ridge rows and smooth plates in the valley rows, and vice versa, or any combination thereof.

In FIGURE 7 of the drawings, I have shown the construction of ridge or longer length brick 21 suitable for utilization in my construction. Each brick member has a substantially rectangular-shaped refractory body terminating in upper and lower end portions Zia and 211?. To provide a slight wedge shape, the top portion 21a is slightly wider across its major dimension than the bottom portion 2lb. For a ridge brick having a length of about l5 inches, the top width may be about six inches and the bottom width about 51/2 inches. yA shorter length or valley brick 22, shown in FIGURE 7A may have, for example, a length depthwise of about l2 inches; the same width relationships may govern as to its end portions 22a and 22b. It will be noted that the brick of FIGURES 7 and 7A are identical except for size and thus for simplicity or" illustration, I have employed similar alphabetical sutiixes to indicate corresponding portions or parts of the two brick constructions. Assuming the above dimensions, then the short width dimension (thickness) of the refractory body with its casing, of both types of brick, may be about three inches.

Again referring to FIGURE 7, the upper end portion 21a is provided with inset, notch or latch portions 21C that are open along one wide side face and two opposite end or narrowside faces. The portions 21C serve as interlatching portions for the brick with respect to lug projections 23e of side plate members 23, see FIGURE S. As shown, the refractory body may be encased by a suitable metal casing 21d of stainless steel or other suitable material which is folded over it and is shown as ending in an open seam Zie, lengthwise along one narrow side or edge end face of the brick, and as terminating at its top and bottom portions short of the extreme top and bottom ends of the refractory body.

In FIGURE 8 I have disclosed a side plan member 23 that is provided with opposite edge notches or latch portions 23a, near its top end portion 23h, to latch within or interlock with adjacent, spaced-apart pairs of beam members I7 of the metal overhead truss construction. Also punched `out projections, fingers or lug pairs 23C are shown formed in the upper end portion 23!) to project from one side face thereof and extend in a curvilinear or arcuate path along its longitudinal extent. Each lug pair 23e, as shown for example in FIGURES 4 and 5, yis adapted to engage within opposed latehing slots 21C of pairs of wide face-abutting adjacent brick 2l. FIG- URE 9 shows a similar construction of a side plate member for the shorter length brick Z2, whose similar portions and parts are indicated yby primes for simplicity of illustration. In FIGURE l0, the side plate construction 23 has latching notches 23a near its top end portion 23"b, but does not have the lug projections 0f the constructions of FIGURES S and 9. Using the latter plates, as previously intimated, the brick are held in position by friction, without the interlatching engagement of latching portions.

It is thus apparent that where smoothplate members 23" (see FIGURE l0) are employed between valley brick 22 (see the brick of FIGURE 7A and the general as- `s embly of FIGURE 4), such brick are indirectly held down by the arch construction of FIGURE l. This is true since they are held in a wedged relation against the plate members and. the latter are hooked at their vertical notched or forked ends (interlocked) over lower flanges of the beams I7 (see FIGURE 5); the smooth type of plate members 23 may be usedvto facilitate replacement of burned or worn-out brick. On the other hand, if plate members 23 (see FIGURE 9) having brick-intertting or latching tabs are used, the valley brick 22 are directly held down by the arch or truss construction.

The ridge block or tile 21 (see FIGURE 7) always employ plate members 23 having latching tabs (see FIG- URE 8) and are thus always directly held down by the arch or truss. It will be noted that the forked, notched or indented end portions, such as 23a, latch engage across between the bottom flanges of adjacent pairs of the lower frame members I7, and that the side plate members are demountably embedded vertically along and between adjacent brick of the brick rows. It will be further noted that all of the demountable plate hangers 23, 23 and 23 (see, for example, FIGURE 3) interlock or inter-engage with the rigid support members or cross beam members 17 in such a manner as to prevent longitudinal as well as vertical up or down movement, and that this latching is across their narrow sides or thicknesses to give maximum resistance. This provides minimum expansion flexibility through the body of the members 23, 2.3' and 23", in combination with an alignmentholding or position-retaining action, such that the individual brick are held to the contour of the roof arch and cooperatively with respect to each other.

Referring particularly to FIGURES l and 6, it will be noted that the furnace construction is provided with a skewback frame having upright end members 26 which extend upwardly between the channel p-airs 12 and are secured at their upper ends to the cross channel members Il. of the roof truss framework. Skewback I-beam members 27 are carried between upright members 26 and are provided with inwardly-projecting channel pieces 28 that are secured to their upper lianges to project inwardly and engage with end vertical members 14 and with arch or chord members 16. The members 28 are secured thereto, as by welding, to form a unitary structure. Skewback or end refractory brick or filler block Si) are supported on the lower iianges and against the web p ortions of the I-beam members 27 to project into closingofI" abutment with refractory roof brickwork or arch that is made up of brick 21 and 22. It will be noted that the block 3@ have inner sloped faces to receive the brick rows of the arch brickwork in abutment therewith.

As shown particularly in FIGURE 6, end side plate members 31 may be of the same general construction shown in FIGURES 8 to lO, inclusive, except that they are of shorter length and their outer ends do not have a latching offset portion 31a. It is thus apparent that the voussoir brickwork of my roof construction are held in position at their ends by the skewback brick or block members .30 and structural framework members which form an integral part with the top truss framework.

Summarized briefly, in my construction, I provide overhead metal truss framework of a rigid nature which has suspension members 14 and cross vbrace members 15 projecting downwardly therefrom to secure and cooperate with transversely spaced-apart radial, arcuate or curved and longitudinally-extending arc-shaped members 16. These members 16, in turn, carry longitudinally spacedapart and transversely-extending backup or support beam members I7 in alignment with lower terminal ends of the suspension members 14 and 1S and whose bottom llange serve as latching means for longitudinally-extending rows of side plate members 23 and 23 which have a transversely spaced relationship with each other corresponding to the width of brick rows, see particularly FIGURES l, 2. and 4.

The side plate members 23 and 23 carry brick vgroups of the brick rows that fill the spacing between adjacent pairs or" the cross beam members. I7. The side plate members interlatch between the bottom flanges of lsuch pairs to provide a longitudinal progression of suspended brick groups for each row. Transversely of the furnace, as shown particularly in FIGURES 2 and 4, lthe brick extend in side plate alignment with each other in valley or shorter length and in ridge or longer length alternate groups, transversely of the furnace, and along each cross support beam il?. Each brick, as shown in FIGURES l, 3 and 5, is in side face abutment with adjacent brick of its own group and of its own row, longitudinally of the furnace, but each brick along its narrow sides or ends, is in abutment with or is spaced from adjacent transverse rows of brick by the side plate members, as shown particularly in FIGURES 2 and 4. As illustrated also in the latter iigures, the radially-shaped truss construction of my suspension roof is in hold-down contact vwith alternate transverse groups or, in other words, with ridge or longer brick `groups of the transverse rows, and all of the brick are supported by side plate members which hang them from the hold-down truss structure.

The side plate members are deeply embedded in the brickwork and, as an optimum, in an interlatching relationship with adjacent brick of such structure; they suspend brick groups with respect to the truss Structure. The arch members 16 or the hold down truss structure span the roof and, irl-effect, consist of radially-shaped bottom chords which, in turn, support backup beams ,17 from which the side plate members are suspended and with which they are interlatched. The skewback end construction may be of somewhat conventional construction.

Although my roof construction has been devised particularly to meet the problem heretofore presented in connection with the utilization of so-called basic brickwork,

it will be understood that it is also suitable for any type of brickwork, including silica brick and brick with or without metal cladding. It will be noted from a comparison of FIGURE 1 and 2 and of FIGURES 4 and 5 that the refractory thickness in one direction of the furnace may be greater than in another. Thus, I contemplate the employment of conventional internal plates .to

' extend vertically of the refractory brick to provide even metal distribution, both longitudinally and transversely of the furnace and thus, a more uniform heat distribution and transfer. For example, if a brick in the direction of FIGURES 2 has a thickness of about three inches and such brick in the direction of FIGURE 1 has a thickness of six inches, a mid-vertical, internal plate may be used in the direction of FIGURE 1 within the brick to provide the same three inch spacing of metal in the direction represented by FIGURE l. Chemically bonded brick with internal plates may be used in this connection. it will also be apparent that the side plate members may be staggered or omitted between some brick of the brick rows or assemblies to provide a desired type of heat distribution, for example.

Referring to FIGURE 5 of the drawings, l also contemplate the insertion of conventional metal shims, such as of 1A; inch thickness between brick along the inner side of the brickwork, if expansion joints are needed.

Referring to FIGURE l, I also contemplate making the chord members 16 of half or partial length sections to facilitate repair of the installation. In such a case, plates may be used for splicing or linking the chord sections or lengths together to form a complete chord member or length 16 for the roof. Also, although my invention has been devised primarily from the standpoint of problems presented in an arch type of roof, its novel features may be employed with a fiat type of roof, by employing plate members that interlatch with the brick of the brickwork.

FIGURE 2B of the drawings illustrates a modified arrangement or assembly of roof structure or metal `framework members to facilitate the use of an oxygen lance A, where desired. By using a pair of suspension members 14 and placing them adjacent the ends of the connector members 13, the lance A may be introduced downwardly between the members 12 and 14, past the members 1l, 13 and '17, and through an opening in the brickwork into the furnace.

What I claim is:

1. A furnace roof construction with comprises, an overhead framework provided with members defining a rigid holddown truss which spans the longitudual extent of the roof, said framework having lower members in a spaced-apart relation therealong, a series of brick rows beneath said spaced-apart lower members in an arched relationship, each brick row extending longitudinally at right angles to said spaced-apart lower members, adjacent brick across said series of rows defining a ridge and valley relationship along said spaced-apart lower members, side plate members demountably embedded verticaly along and between transversely adjacent brick of the brick rows and having notched end portions latchengaging against vertical movement across between longitudinaliy-adjacent pairs of said spaced-apart lower members to suspend the brick rows therefrom, and the plate members along brick rows representing the ridges and valleys having side projections interlatching, therewith.

2. A furnace roof construction which comprises, an overhead framework provided with members defining a hold-down truss which spans the roof, said framework having lower support members in a spaced-apart relation therealong, brick rows beneath said lower members, a row of side plate members demountably embedded vertically along-between adjacent brick of at least a pair of said brick rows and having forked opposite end portions to latch-engage across-between adjacent pairs of said lower members to suspend said brick rows therefrom, and one forked end of each of said side plate members latchengaging the same lower member as the opposite forked end of adjacent side plate members of the same row of side plate members to define with said lower members a substantially continuous row of said side plate members.

3. A furnace roof construction which comprises, an

overhead framework provided with members defining a hold-down truss which spans the roof, said framework having lower beam members in a spaced relation therealong, brick rows beneath said lower beam members, rows of side plate members vertically along-between brick rows, said side plate members having side projections therealong demountably latching with adjacent brick of a brick row and having forked opposite end portions to latch-engage across between adjacent pairs of said lower beam members to suspend said brick rows therefrom, and one forked end of each of said side plate members latch-engaging the same lower beam member as the opposite forked end of adjacent side plate members of the same row of side plate members to define with said lower beam members a substantially continuous row of said side plate members.

4. A furnace roof construction which comprises, an overhead framework provided with members defining a hold-down truss which spans the roof, said framework having lower support members in a spaced relation therealong, brick rows beneath said lower members and extending at substantially right angles with said lower members, a row of side plate members demountably embedded vertically-along-between adjacent brick of at least a pair of said brick rows and latch-engaging with adjacent brick of one of said brick rows, a second row of side plate members vertically along the opposite side of the other brick row of said pair of brick rows and interlatching with adjacent brick thereof, said side plate members having forked opposite end portions to latch-engage across between adjacent pairs of said lower members to suspend said brick rows therefrom, and one forked end of each said side plate members latch-engaging the same lower member as an opposite forked member of an adjacent side plate member of the same side plate member row to define with said lower members a substantially continuous row of said side plate members.

5. A furnace roof construction which comprises, an overhead framework provided with members defining a hold-down truss which spans the longitudinal extent of the roof, said framework having cross-extending spacedapart lower members suspended from said framework in an arcuate relation with each other longitudinally beneath said framework, brick row, each brick row extending longitudinally of the framework in an arched relation across and beneath said lower members, a row of side plate members demountably embedded vertically along and between adjacent brick of at least a pair of said brick rows in a longitudinally aligned end-to-end relation along said framework and across-between said lower members, said side plate members extending fully along in a longitudinal arcuate relation between the adjacent brick of said pair of brick rows and having opposite longitudinal end portions that are forked to latch-engage across-between adjacent pairs of said lower members to suspend the brick rows therefrom, and one forked end portion of one of said side plate members latch-engaging the same one of said lower members as the opposite forked end portion of an adjacent side plate member of the same longitudinal row.

6. A furnace roof construction which comprises, an overhead framework having members defining a holddown truss which spans the longitudinal extent of the roof, said framework having transversely spaced-apart arch members of arcuate shape extending longitudinally therebeneath, said framework having spaced-apart transversely-extending lower members in a suspended arcuate relation with each other along said arch members, at least a pair of brick rows beneath said spaced-apart lower members, each brick row extending in an arched relation longitudinally of said framework, and a row of side plate members demountably embedded vertically along and between adjacent brick of said pair of brick rows and eX tending longitudinally of said framework, and said row of side plate members having opposite longitudinal end portions that are forked to latch-engage across-between adjacent pairs of said lower members to suspend the brick rows therefrom.

7. A furnace roof construction which comprises, an overhead framework provided with members defining a hold-down truss which spans the longitudinal extent of the roof, said framework having crossextending spacedapart lower members suspended from said framework in an arcuate relation with each other longitudinally beneath said framework, brick rows, each brick row extending longitudinally of said framework in an arched relation across and beneath said lower members, rows of side plate members, the side plate members of each side plate member row being demountably embedded vertically along and between adjacent brick of said brick rows in a longitudinally aligned end-to-end relation along said framework and across and between said lower members, each row of said side plate members extending fully along and in a longitudinally arcuate relation between the adjacent brick of said brick rows and having opposite longitudinal end portions that are forked to latch-engage across-between adjacent pairs of said lower members to suspend the brick rows therefrom, one forked end of one of said side plate members latch-engaging the same one of said lower members of the same row of side plate members as an opposite forked end of adjacent side plate members of the same row, said brick rows comprising valley and ridge members, said ridge members being in abutment with said lower members, said valley members being in a vertically-spaced position below said lower members, and said side plate members projecting upwardly beyond upper reaches of the valley and ridge members of said brick rows to dene cooling tins for the brick rows.

8. A furnace roof construction suitable for a basic brick roof which comprises, a rigid overhead truss structure having arcuately-extending bottom chord members, brickwork beneath said truss structure, support members demountably embedded vertically between and along members of said brickwork and having opposite end portions, said bottom chord members having means engaged by and securely interlatching the opposite end portions of said support members against Vertical movement with respect to said truss structure to suspend said brickwork therefrom, and said support members being hung 10 from said means as joint fillers along the furnace roof for the brickwork.

9. A furnace roof construction as defined in claim 8 wherein, the opposite end portions of said support members are forked, each of said means has opposite anges, and one forked end portion of one of said support members is interlatched with one ange of one said means and the opposite forked end of an adjacent one of said support members is interlatched with the opposite flanges of said one means.

' l0. A. supporting structure for refractory brickwork in a furnace roof construction which comprises, an overhead truss structure provided with spaced-apart lower cross beam members, a plurality of vertically-extending side plate members having notched opposite vertical latching end portions latch-enaging on opposite bottom end portions of adjacent pairs of said beam members to support the brickwork and define rows of side plate members, the opposite latching end portions of each of said side plate members being supported by and latchengaging between adjacent pairs of said beam members, and side plate members of each side plate member row at their latching end portions latch-engaging the same beam members as latching end portions of adjacent side plate members of the same row.

11. A supporting structure as defined in claim 10, wherein said side plate members have side projections therealong to latch-engage with the brickwork for supporting it on said cross beam members.

References Cited in the file of this patent UNITED STATES PATENTS 1,712,919 Harter` May 14, 1929 1,789,074 Jacobus Jan. 13, 1931 1,948,798 Nygaard Feb. 27, 1934 1,966,482 Bollinger July 17, 1934 2,044,637 Ross June 16, 1936 2,222,978 Kiren Nov. 26, 1940 2,641,207 Pollen June 9, 1953 2,664,836 Rawlings Jan. 5, 1954 2,781,006 Heuer Feb. 12, 1957 2,929,343 Hutter Mar. 22, 1960 FOREIGN PATENTS 938,265 Germany Jan. 26, 1956 771,895 Great Britain Apr. 3, 1957 UNITED .STATES PATENT. OFFICE CERTIFICATE 0E CORRECTIoN Patent NQ? lOOulQi October211gl 1961 l Levi S,.'|Lo ngenecker l It is vhereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 6 line 59V for "or" read mof uw; Column 7V line 57 for "FIGURES" yfceaal FIGURE w; ,same colvumnmlines 51^and 52Vv for "vertiealy" lread vertically mg Column Bq line 1.3V for v"TOWH first ocoursr'enceV fread rows Signed and sealed this 3rd day of April 1962.

ERNEST W. SWIDER DAVID" L. LADD- Y Y Atestillg Ufficl Commissioner of Patents 

